Got Campus Placement! What Should I Focus on in the Next 7 Months?

I've already secured a on campus placement (fingers crossed they don't revoke the offer!). Now, I have around 7 months before I join. During this time, I primarily need to focus on studying my electives and completing my major project.

That said, I also want to make the most out of these months . Here's where I stand currently: I have a solid understanding of the MERN stack and my DSA knowledge is at a good level too

Given this, what topics or skills should I focus on? Are there any tools, technologies, or certifications that would add value? Or any practices (like contributing to open source or competitive programming) that I should prioritize?
I’d love to hear your advice and suggestions!